Where should I insert it
dissolved oxygen
non-volatile
From vegetable gardens to flower beds and greenhouse crops
7-in-1 Hydroponic Water Quality Meter – pH, EC, TDS, Salt, Temperature Tester gardening accessories Where should I insert itThis advanced 7 in 1 Water Quality Meter is perfect for hydroponic growers, gardeners, and aquarium owners who need precise readings to maintain healthy plants and environments. With the ability to test pH, TDS, EC, ORP, salt, temperature, and fertility, it provides everything you need to ensure your water conditions are just right. Comprehensive Testing: Measure pH (014), TDS (010000ppm), EC (010000 S cm), ORP, salt, temperature (060C), and fertility